[A case of neurosarcoidosis with recurrent episodes of neurological dysfunction and diffuse cortical lesions on magnetic resonance imaging].

We report a case of a 35-year-old man with histologically confirmed neurosarcoidosis who developed recurrent episodes of right-hemispheric dysfunction with diffuse cortical lesions of the right hemisphere on magnetic resonance imaging (MRI). A brain biopsy revealed granulomatous inflammatory cells in both the subarachnoid space and Virchow-Robin space, which might relate to the recurrent neurological dysfunction and MRI findings.

Age-dependent change in metabolic response to photic stimulation of the primary visual cortex in infants: functional magnetic resonance imaging study.

The blood oxygen level-dependent (BOLD) response to photic stimulation in the primary visual cortex (V1) reverses from positive to negative around 8 weeks of age. This phenomenon may be caused by increased oxygen consumption during stimulation as the result of a rapid increase of synaptic density at this age. To test this hypothesis, we applied existing mathematic models of BOLD signals to the experimental data from infants.

Differentiation of prostate cancer from benign prostate hypertrophy using dual-echo dynamic contrast MR imaging.

Objective: To investigate the usefulness of dynamic contrast magnetic resonance (MR) imaging in the differentiation of prostate cancer (PC) from benign prostate hypertrophy (BPH).

Materials And Methods: Eleven PC patients and 13 BPH patients were entered into the analysis. The mean gradient (MG) was calculated from the T2* term-eliminated time-signal intensity curve obtained from dynamic contrast MR data, and the MG of PC and that of BPH were compared.

H(2) (15)0 positron emission tomography validation of semiquantitative prostate blood flow determined by double-echo dynamic MRI: a preliminary study.

Purpose: Information regarding prostate blood flow as determined by positron emission tomography (PET) with H 0 may provide useful information about tumor diagnosis; however, PET requires a cyclotron for the production of an extremely short half-life (2 minutes) tracer. Therefore, the aim of this study was to propose a complementary index for blood flow as determined by MRI to validate the results and compare them with PET, especially for prostate tissue.

Methods: Six consecutive patients with prostate disease were studied.

11C-acetate PET imaging of prostate cancer.

Unlabelled: 11C-Acetate can act as a probe of tissue metabolism through entry into catabolic or anabolic metabolic pathways as mediated by acetyl-coenzyme A. The uptake of (11)C-acetate in prostate cancer was investigated to determine whether this tracer has potential in tumor identification.

Methods: Twenty-two patients with prostate cancer underwent PET after intravenous administration of 740 MBq (11)C-acetate.